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914

Appendix: IL

upon it: the latter being decomposed into H and 0 recombines
with the coke and forms a rich gas; but as continuous produc-
tion is impossible, there is a 'blow' for ten minutes, and then a
re-admission of air to revive combustion. Pouter gas, known as
Dowson gas in England and Lencauchez gas in France, is made
from coke or anthracite (so as to avoid tar), and can be worked
continuously, the steam and air being admitted together in proper
proportions. Fig, 877 shews a Buire-Lencauchez gas plant,

where A is the coke furnace,, supplied with fuel at the top, with
steam at B, and with air at c. The gas escapes at D, and passes
through the c scrubber' E, \vhich is filled with coke to spread the
trickling water and so absorb ammonia; thence to holder F, from
which it is drawn by the engine. One volume of gas to 2-| of air
is required, so an engine designed for lighting-gas must have its
valves altered; a scavenging charge is also necessary. The
following consumptions were obtained with lighting gas :

CUBIC FEET OF GAS USED PER HOUR-


	
	
	
	.
	d
	
	


	1
	1
	l|
	if
	I
 1
	|
	1


	^
	W
	
	0
	!
	M
	0

PerI,H.P. hr.
	88 to 105
	77 to 92
	26
	17 to 25
	*
	21'S
	

PerB.H.P,hr,
	...
	...
	...
	197 1029
	M'5.
	26-8
	23 to 28